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Personnally, I would recommend a "LAMP" environment as the new platform for your application. "LAMP" is an acronym for Linux (Operating System), Apache (Web engine), mySQL (database engine) and PHP (programming language). mySQL supports referential integrity and transaction rollback. Depending on your low- or high-concurrency situation, mySQL supports optimistic or pessimistic record locking. Another advantage of the "LAMP" architecture is that your server and data can be anywhere, used from anywhere and maintained from anywhere and this can dramatically reduce the total cost of ownership of your application.

For more information, I suggest that you contact me by email: stephane.quenson (at) gmail (dot) com.